Earlier quoted context omitted.
It's because 40 hours was quite simply discovered to be a more productive length of day That was true when most of the workforce was doing manual and factory style labour. To the best of my knowledge it hasn't been rigorously reproduced for works that spend their days staring at a screen thinking.
And if it's not been rigorously tested, then there doesn't seem to be any strong case to assume that the ideal number for office work is higher, rather than lower, than 40. I'm also wondering how commute time (and method of commute) factors into this. Does 30 minutes of physically strenuous cycling before/after work have a positive or negative impact on office workers? Does the same time spent in a car navigating sto…
Absolutely. I'm at least as convinced that 35 hours is optimal time as I am that 45 is. I also agree with your point about commutes. Instead of looking at time in the office it probably makes more sense to look at the time from when one leaves home to when one leaves the office. And speaking only for myself, having to drive 30 minutes to work each morning would be a pretty major deal-breaker for any job I'd consider.